You may need to reset your router to factory defaults in these situations:
Here are some best practices to keep in mind when upgrading the firmware of your TP-Link Archer C5 V4 router: tp-link archer c5 v4 firmware upgrade
Log in with your admin credentials. If you never changed the default login, the username and password will both be admin . Step 3: Back Up Your Current Settings You may need to reset your router to
Once the router reboots and the front LED lights stabilize, verify that the update was successful. Verify the Installation Verify the Installation : The router will process
: The router will process the update and reboot automatically. Do not turn off the power during this process, as it can permanently damage (brick) the device. Alternative: Online Upgrade
Never perform a firmware upgrade over Wi-Fi. If the connection drops, your router could become a "brick".
If your router supports Cloud services, you can often update directly through the web interface or the .